An insulated rigid tank contains two chambers, each with a volume of 0.25 m³. Air at 400 kPa and 50° C is contained in one chamber of the insulated tank. Air at 250 kPa and 200° C is contained in the other chamber of the insulated tank. The air in the two chambers is suddenly mixed when the wall dividing the two chambers is punctured.

A. Determine the final temperature and pressure of the air.

B. Determine the change in entropy of the system during the process.

C. Why does the entropy increase in this process?